21 加法 4 等于多少？
21 + 4 = 25
21加法4 等于 25
竖式演算
验算
- 用减法验算：25 − 4 = 21
- 用减法验算：25 − 21 = 4
相关题目
21 + 3 = 24
21 + 5 = 26
21 + 2 = 23
21 + 6 = 27
21 + 1 = 22
21 + 7 = 28
21 + 8 = 29
21 + 9 = 30
20 + 4 = 24
22 + 4 = 26
19 + 4 = 23
23 + 4 = 27
24 + 4 = 28
18 + 4 = 22
25 + 4 = 29
17 + 4 = 21
1 + 24 = 25
2 + 23 = 25
3 + 22 = 25
4 + 21 = 25
5 + 20 = 25
6 + 19 = 25
60 + 35 = 95
40 + 46 = 86
15 + 82 = 97
1 + 78 = 79
3 + 73 = 76
24 + 1 = 25
35 - 10 = 25
56 - 31 = 25